EP2232236A1 - Surveillance d'une condition et/ou d'une qualité d'huile, en ligne ou de ligne, sur la base d'une analyse de données chimiométriques de fluorescence et/ou de spectres proches infrarouges - Google Patents

Surveillance d'une condition et/ou d'une qualité d'huile, en ligne ou de ligne, sur la base d'une analyse de données chimiométriques de fluorescence et/ou de spectres proches infrarouges

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Publication number
EP2232236A1
EP2232236A1 EP08864392A EP08864392A EP2232236A1 EP 2232236 A1 EP2232236 A1 EP 2232236A1 EP 08864392 A EP08864392 A EP 08864392A EP 08864392 A EP08864392 A EP 08864392A EP 2232236 A1 EP2232236 A1 EP 2232236A1
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European Patent Office
Prior art keywords
sample
oil
electromagnetic radiation
variable
data
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EP08864392A
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German (de)
English (en)
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EP2232236B1 (fr
Inventor
Ole Olsen
Kristoffer Kampmann
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MEDICO KEMISKE LABORATORIUM APS
MEDICO KEMISKE LAB APS
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MEDICO KEMISKE LABORATORIUM APS
MEDICO KEMISKE LAB APS
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2888—Lubricating oil characteristics, e.g. deterioration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N2021/6417—Spectrofluorimetric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6408—Fluorescence; Phosphorescence with measurement of decay time, time resolved fluorescence
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6445—Measuring fluorescence polarisation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N21/8507—Probe photometers, i.e. with optical measuring part dipped into fluid sample
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/94—Investigating contamination, e.g. dust
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/129—Using chemometrical methods
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/129—Using chemometrical methods
    • G01N2201/1293—Using chemometrical methods resolving multicomponent spectra
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/129—Using chemometrical methods
    • G01N2201/1296—Using chemometrical methods using neural networks

Definitions

  • the present invention relates to a method and a device for monitoring oil condition and/or quality based on fluorescence and/or NIR spectra as well as laboratory reference measurements on a set of oil samples.
  • chemometric data analysis i.e. multivariate data analysis
  • the spectroscopic signals and patterns will be correlated to the laboratory reference measurements that describe the condition and/or quality of the oil. Based on this relation it is possible to predict the reference measurements and/or conditions of a new oil sample based solely on a fluorescence and/or NIR spectrum of the sample.
  • US 2007/0187617 discloses a method for monitoring the oxidation of oil samples by exposing the sample to ultraviolet irradiation and detecting in 2 narrow wavelength ranges the emitted fluorescence.
  • the ratio between the intensity of the fluorescence emitted in the different wavelength ranges changes as a result of the oxidation of the oil, and by tracking the value of this ratio the quality of the oil can be monitored.
  • This method only derives information from a small fraction of the wavelength range emitted from the oil sample. Furthermore, this method has limited used for analyzing unknown samples.
  • NIR near infrared
  • the present invention relates to a method of training a system for characterising an oil sample, said method comprising the steps of
  • step b) repeating step b) to c) until the at least one physical spectroscopic parameter of all oil samples of said batch have been determined
  • the present invention relates to a system for characterising an oil sample, said system comprising:
  • detecting means for recording at least one physical spectroscopic parameter of electromagnetic radiation transmitted and/or reflected and/or emitted from the sample
  • storage means for storing at least one latent variable and/or at least one multivariate model and/or at least one characterisation information of a trained prediction and/or classification system
  • processing means for providing at least one latent variable from the at least one obtained data variable of the sample
  • h) means for correlating the at least one latent data variables from the sample with latent variables of said trained system, thereby obtaining a characterisation of the oil sample, e.g. quantitative parameter predictions and/or at least one class to which the sample belongs, and
  • the invention relates to a method for characterising an oil sample, comprising:
  • the method is preferably carried out in a system trained according to the present invention.
  • the invention relates to a system for the measurement of TBN (Total Base Number) and water in new and used lubricants, comprising
  • a sample domain for comprising an oil sample
  • detecting means for recording at least one physical spectroscopic parameter of electromagnetic radiation transmitted and/or reflected and/or emitted from the sample
  • processing means for providing at least one latent variable from the at least one obtained data variable of the sample
  • h) means for correlating the at least one latent data variables from the sample with latent variables of the trained system, thereby obtaining a characterisation of the oil sample, e.g. quantitative parameter predictions and/or at least one class to which the sample belongs, and
  • the invention relates to a prediction and/or classification system for on-line and/or at-line monitoring of hydraulic oil and/or machine oil comprising
  • storage means for storing at least one latent variable and/or at least one multivariate model and/or at least one characterisation information of a trained prediction and/or classification system
  • processing means for providing at least one latent variable from the at least one obtained data variable of the sample
  • h) means for correlating the at least one latent data variables from the sample with latent variables of the trained system, thereby obtaining a characterisa- tion of the oil sample, e.g. quantitative parameter predictions and/or at least one class to which the sample belongs, and
  • the invention relates to a prediction and/or classification system for on-line and/or at-line monitoring of hydraulic oil and/or machine oil comprising
  • detecting means for recording at least one physical spectroscopic parameter of light transmitted and/or reflected and/or emitted from the sample
  • e) storage means for storing at least one latent variable and/or at least one mul- tivariate model and/or at least one characterisation information of a trained prediction and/or classification system
  • processing means for providing at least one latent variable from the at least one obtained data variable of the sample
  • g) means for correlating the at least one latent data variables from the sample with latent variables of the trained system, thereby obtaining a characterisation of the oil sample, e.g. quantitative parameter predictions and/or at least one class to which the sample belongs, and
  • Figure 3 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for viscosity at 40 degrees
  • Figure 5 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for TBN
  • Figure 6 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for Silicon
  • Figure 7 Emission spectra at 230 nm excitation for several oil samples.
  • Figure 8 Classification of new and used samples.
  • Figure 10 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for viscosity.
  • PLS model on Main engine oil in use (group 1) and Main engine new oil (group 2) for KV100.
  • PLSC is 6.
  • Figure 1 1 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for density.
  • PLSC is 7.
  • Figure 12 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for TAN.
  • PLSC is 3.
  • Figure 13 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for TBN.
  • PLS model on Main engine oil in use and Main engine new oil (group 1 and 2) for TBN PLSC is 7.
  • Figure 14 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for sulfur.
  • PLSC is 1.
  • Figure 15 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for phosphor.
  • PLS model on Main engine oil in use and Main engine new oil (group 1 and 2) for P. PLSC is 12.
  • Figure 16 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for vanadium.
  • PLSC is 7.
  • Figure 17 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for nickel.
  • PLSC is 10.
  • Figure 18 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for magnesium.
  • PLSC is 8.
  • Figure 19 Laboratory value versus the value predicted by the chemometric model and NIR spectroscop for calcium.
  • PLSC is 5.
  • the invention relates to quantitative prediction of physical and/or chemical values or qualitative classification of oils sample status based on spectroscopic parameters obtained from near infrared and/or luminescence spectroscopy.
  • Fluorescence spec- troscopy is used as an example of luminescence spectroscopy in the present invention.
  • other physical parameters may be used in the prediction and/or classification.
  • fluorescence is used as an equivalent of any luminescence type and is to be interpreted as such, unless inappropriate in specific embodiments.
  • Fluorescence spectroscopy is an extremely sensitive analytical tool and near infrared spectroscopy is a very precise analytical tool.
  • the data obtained from both types of spectroscopic analyses can be considered a finger-print of the sample.
  • Each sample gives rise to a unique spectroscopic set of physical parameters, and as is described in the present invention it is possible to form the finger-prints to predict the value of physical-chemical components of the oil, such as water, viscosity (at differ- ent temperatures), Total Base Number (TBN), Total Acid Number (TAN), carbon residue, density, flash and fire points, pour point, sulphated ash, score values in various performance tests, and the content of Particles, Silicon, Sodium, Boron, Iron, Aluminum, Chromium, Molybdenum, Copper, Lead, Tin, Nickel, Titanium, Silver, Phosphorus, Zinc, Calcium, Barium, Magnesium, and Sulfur.
  • the fluorescence and near infrared spectroscopic fingerprint can be used either alone or in a combination to obtain synergy in the prediction models. Furthermore, as also described by the present invention, when analysing the spectroscopic data, it has become possible to classify samples into two or more classes based on the spectra, if there is any systematic difference between the samples. The difference between the samples will mostly not relate to a single component, or a few components of the sample, but rather to a combination of a wide variety of components. This combination exhibits a pattern so complex that it is detectable by the multivariate analyses only.
  • classification information may be any information regarding sample condition, such as information regarding presence/absence of specific components, determination if the oil is used/not used (can also be quantified), determination of which type of engine the oil is used in.
  • the oil can be a fuel.
  • the evaluation of the spectroscopic parameters it is possible to obtain more information about an oil sample, than it is when evaluating the various chemical components in the sample individually, i.e. it is possible to obtain inter- component information. Furthermore, there is no need to know the exact composition of components in the sample, as it is either the fluorescence or the near infra- red absorption spectra or the combination of these finger-prints that contain the relevant information. If so desired, in a specific application, it may be possible to give a chemical characterisation of the information used by the classification system.
  • the invention in a first aspect relates to a method of training a prediction system for quantifying multiple chemical and/or physical parameters in an oil sample. It is the purpose of the training that a system is obtained, said system holding enough information to be used for quantitative prediction of multiple chemical and/or physical parameters in an unknown oil sample.
  • unknown is meant a sample for which no characterisation information is known and only the near infrared and/or fluorescence spectrum is known. The prediction as such is only based on a model and the measured spectroscopic fingerprint(s).
  • the invention in another aspect relates to a method of training a classification sys- tern for characterising an oil sample. It is the purpose of the training that a classification system is obtained, said system holding enough information to be used for characterising an un-classified and unknown oil sample into one of the classes of the classification system.
  • unknown is meant a sample for which no characterisation information is known.
  • this training incorporates a validation that substantiates how well prediction and/or classification can be performed on specific samples in the future as well as improving the validation performance over time.
  • the electromagnetic radiation exposing the sample comprises monitoring radiation and/or excitation light.
  • the oil sample may be any sample suitable for spectroscopic analyses. It is an object of the present invention to acquire the necessary information from the sample using as few pre-treatments as possible, preferably without any pre-treatments as such. Accordingly, in a most preferred embodiment the sample is transferred directly as is to be subjected to spectroscopic analysis, in order to obtain data relating to untreated samples.
  • the oil sample is subjected to spectroscopic analyses without drying, and preferably without any other changes in concentration.
  • the sample may be arranged in a sample compartment being closed or open before exposing the sample to light.
  • Excitation light The physical parameters may in principle be obtained for a wide variety of excitation light wavelengths.
  • the wavelengths are preferably selected to be within the range from 100 nm to 1000 nm, such as from 100 to 800 nm, more preferably within the range of from 200 nm to 800 nm, such as from 200 nm to 600 nm.
  • wavelengths are used, such as from 2 to 100 wavelengths, for instance 2-30, such as 2-10, for instance 2-6 wavelengths in order to describe an excitation-emission matrix optimally.
  • Sets of wavelengths may be chosen so that each wavelength differs from the other by at least 0.1 nm, such as 0.5 nm, for instance at least 1 nm, such as 5 nm, for instance at least 10 nm, such as 50 nm, for instance at least 100 nm, such as 150 nm, for instance at least 250 nm, such as 500 nm, for instance at least 600 nm, such as 700 nm, and at most 750 nm.
  • excitation light wave lengths are selected such as 4, 6, 8, 10, or more.
  • the excitation light of each wavelength may be used simultaneously or sequentially.
  • 4 wavelengths are selected, such as excitation light having a wavelength of 230 nm, 240 nm, 290 nm, and 340 nm. Each sample is then subjected to excitation light of each wavelength.
  • the predetermined excitation light wavelength(s) is provided by use of conventional light sources combined with a dispersive element such as a monochromator and/or optical-acoustical wavelength filters and/or conventional filters as is known to a person skilled in fluorescence spectroscopy.
  • a dispersive element such as a monochromator and/or optical-acoustical wavelength filters and/or conventional filters as is known to a person skilled in fluorescence spectroscopy.
  • the physical parameters to be determined in order to perform a data analysis are the intensities as a function of excitation wavelength and/or the emission wavelength.
  • the measurement instrument measuring the intensity may provide other information such as fluorescence lifetime, phosphorescence intensity, as well as phosphorescence lifetime, depolarisation, quantum yield, phase-resolved emission, and circular depolarization.
  • physical emission parameters any physical parameter capable of providing a luminescence related property of the sample.
  • Fluorescence intensity is easily measured at room temperature, and may therefore be chosen for many of the samples. Furthermore, a great number of organic natural products are known to be fluorescent. Phosphorescence may however also be performed at room temperature.
  • Luminescence lifetime in general, as well as phosphorescence lifetimes are defined as the time required for the emission intensity to drop to 1/e of its initial value.
  • phase resolved fluorescence spectroscopy When using phase resolved fluorescence spectroscopy it is possible to suppress Raman and scattered light, leading to very good results for multicomponent systems.
  • spectra are obtained by scanning excitation spectra and measuring intensity with polarizers transmitting in the planes par- allel and perpendicular to the polarisation plane the of exciting light.
  • the degree of polarization or anisotropy may be calculated from the difference of the two measurements to the sum of the two measurements.
  • the emitted light is dispersed or filtered and detected by any suitable detector, such as a scanning camera, a photomultiplier, a diode array, a CCD or a CMOS, all in principle being viewed as two-dimensional array of several thousand or more detectors.
  • the intensity of the light is detected on each detector.
  • one-dimensional detectors may be used as well such as a photomultiplier.
  • emission light intensities at different wavelengths are recorded for each excitation light wavelength.
  • the emission light is sampled with 1 nm intervals.
  • a matrix of excitation-emission data is obtainable for each sample.
  • the spectral distribution of light emitted from the sample is ranging from 200 nm to 800 nm.
  • the emitted light from the samples may be focused onto the detectors by means of conventional focusing systems, as well as passing through diaphragms and mirrors.
  • the detectors are preferably coupled to a computer for further processing of the data.
  • the physical parameters measured or determined by the detector are processed to a form suitable for the further mathematical calculations. This is done by allocating data variables to each physical parameter determined, thus obtaining data variables related to the physical parameters,
  • the physical parameters determined are often subjected to a data analysis through the data variables, such as a one-way matrix of spectral information, a two-way matrix of spectral information, a three-way matrix of spectral information, a four-way matrix of spectral information or, a five-way or higher order matrices of spectral information.
  • the NIR absorption spectrum may in principle be obtained for a wide variety of radiation wavelengths.
  • the wavelengths are preferably selected to be within the range of from 700 nm to 3000 nm, such as from 900 to 2500 nm.
  • wavelengths are used, such as from 2 to 5000 wavelengths.
  • Sets of wavelength may be chosen so that each wavelength differs from the other by at least 0.1 nm, such as 0.5 nm, for instance at least 1 nm, such as 5 nm, for instance at least 10 nm, such as 50 nm, for instance at least 100 nm, such as 150 nm.
  • the absorption at each wavelength may be used simultaneously or sequentially.
  • 4 wavelengths are selected, such as monitoring light having a wavelength of 1300 nm, 1500 nm, 1700 nm, and 1900 nm.
  • the monitoring may also use the wavelengths 2870nm and 3050nm where the absorption of electromagnetic radiation in water is strong. Each sample is then subjected to monitoring radiation of each wavelength.
  • the predetermined monitoring radiation wavelength(s) are provided by use of conventional light sources, dispersive elements and/or filters as is known to a person skilled in near infrared spectroscopy.
  • the physical NIR parameters to be determined in order to perform a data analysis are the absorbance and/or transmission values as a function of wavelength.
  • Near infrared signals are easily measured at room temperature, and may therefore be chosen for many of the samples. Furthermore, a great number of organic natural products are known to absorb in the near infrared region.
  • the transmitted NIR radiation is detected by any suitable detector, such as a semiconductor (e.g. PbS), photo voltaic elements (e.g. InAs, InSb), or a CCD.
  • a semiconductor e.g. PbS
  • photo voltaic elements e.g. InAs, InSb
  • CCD CCD
  • the intensity of the light is detected on each detector.
  • one-dimensional detectors may be used as well such as a photomultiplier.
  • absorbance and/or transmission values are recorded for each excitation light wavelength.
  • the detection of light is sampled with 1 nm intervals.
  • the signals can be recorded also by fibre optic probes, transmission probes, transmission probes for process applications, or reflection/backscattering probes.
  • the near infrared and/or the fluorescence detectors are preferably coupled to a computer for further processing of the data.
  • the physical parameters measured or determined by the detector(s) are processed to a form suitable for the further mathematical calculations. This is done by allocating data variables to each physical parameter determined, thus obtaining data variables related to the physical parame- ters,
  • the physical parameters determined are often subjected to a data analysis through the data variables, such as a one-way matrix of spectral information, a two-way matrix of spectral information, a three-way matrix of spectral information, a four-way matrix of spectral information or, a five-way or higher order matrices of spectral information or mixtures of these data structures.
  • the characterisation information relates to the values (e.g. concentrations) of physical-chemical components in the oil or the classes character- izing the samples.
  • the characterisation information may give information of both qualitative and quantitative information.
  • the characterisation information must be correlated to the spectral information obtained from the sample, in order to obtain the trained system ready for testing un- known samples.
  • Each sample is subjected to fluorescence and/or near infrared spectroscopy before the data analysis is performed in the training of the prediction and/or classification system.
  • the sample may be one sample from oil sample, or several samples from the same oil sample or process, each sample obtained at a different time interval or from different process streams or from different instruments.
  • the determination of the sufficient number of samples is primarily determined by the number of expected latent variables. It is preferred that the ratio of number of training samples to the expected number of latent variables is at least 5:1 , preferably at least 10:1. More preferred the ratio is 50:1 , and even more preferred 100:1. The more training samples, the more reliable a system. Training is a continual improvement of the system and any sample is also a training sample however to a decreasing degree over time.
  • the samples being classified in each class are preferably a representative group of samples to allow the most reliable classification, wherein representative is meant to mean exhibiting all variations influencing said prediction and classification.
  • These variables can for example be oil type, process type, engine type etc.
  • a central aspect of the invention is the performance of a multivariate analysis, whereby the data variables relating to the physical spectroscopic parameters are evaluated.
  • the latent variables being weighted averages of the data variables are obtained.
  • the latent variables describe the variation of the data variables.
  • concentration values of the oils samples can be predicted accurately and/or the samples are classified uniquely into classes.
  • the prediction model and/or the identification of the classes is obtained when each sample is correlated to the characterisation information relating to said sample.
  • the multivariate statistical methods suitable for the present invention are for example represented by chemometric methods like principal component analysis (PCA), partial least squares regression (PLS), soft independent modelling of class analogy (SIMCA) and principal variables (PV).
  • Other multivariate statistical methods include: Principal component analysis 14 , principal component regression 14 , factor analysis 2 , partial least squares 14 , fuzzy clustering 16 , artificial neural networks 6 , parallel factor analysis 4 , Tucker models 13 , generalized rank annihilation method 9 , Locally weighted regression 15 , ridge regression 3 , total least squares 10 , principal covariates regression 7 , Kohonen networks 12 , linear or quadratic discriminant analysis 11 , k-nearest neighbors based on rank-reduced distances 1 , multilinear regression methods 5 , soft independent modeling of class analogies 8 , robustified versions of the above and/or obvious non-linear versions such as one obtained by allowing for interactions or crossproducts of variables, exponential transformations etc.
  • the classification system may be obtained on the spectral information only. However, in some situations it may be appropriate to incorporate other variable(s) in the multivariate analyses.
  • variables relating to the sample supplying the spectral information may be variables that compensate for a specific condition of the sample.
  • Examples hereof may be the measurement of pH and temperature in the sample before subjecting it to spectroscopy. Thereby, variations in the other variables may be compensated for in the final prediction and/or classification.
  • other variables are variables relating to the oil sample to be characterized. Examples of these variables are oil type, origin, transport history, and process conditions.
  • pre-treatment may be adjustment of pH of the sample to a predetermined value, or heating or cooling the sample to a predetermined temperature.
  • the sample may be treated with chemicals, e.g. in order to develop fluorescent complexes involving inherently non-fluorescent molecules in the sample.
  • pre-treatment include addition of chemical substances, measurement under a gradient imposed by varying additions of chemical substances, and simple chromatographic pre-treatments based on either chemical or physical separation principles.
  • Another aspect of the present invention is the prediction system for quantitative assessment of oil sample quality parameters.
  • the system and methods according to the invention provides means for predicting one or more oil quality parameters simultaneously and/or classifying the oil samples into at least two different classes correlated to the characterisation information, obtaining a trained prediction and/or classification system.
  • the prediction system When the prediction system has been trained as discussed above, it is ready for prediction of one or more quality parameters samples with unknown characteristics.
  • the prediction system preferably comprises the following components: a) a sample domain for comprising the oil sample,
  • detecting means for recording at least one physical spectroscopic parameter of electromagnetic radiation transmitted and/or reflected and/or emitted from the sample
  • processing means for providing at least one latent variable from the at least one obtained data variable of the sample
  • i) means for displaying the prediction(s) of a sample.
  • Another aspect of the present invention is the classification system for characteris-ing an oil sample into at least one predetermined class.
  • the classification system When the classification system has been trained as discussed above, it is ready for classifying samples with unknown characteristics.
  • the classification system preferably comprises the following components: a)-e) Identical to the steps for Prediction system,
  • processing means for providing latent variables from data variables of the sample
  • i) means for displaying the characterisation class(es) of a sample.
  • the sample domain may be a sample chamber for accommodating a container with a liquid, a solid or a semi-solid sample.
  • the sample domain may also be a domain in a process stream, vessel or engine.
  • the oil sample may be obtained from an oil engine, a tank, a process stream, a vessel step, or a transmission, or any other oil containing and/or using unit.
  • the prediction and/or classification system may be provided as a whole unit, wherein the spectroscopy of the sample is conducted by the same unit from where the data relating to the characterisation classes of the sample is displayed.
  • the system is comprised of at least two units, wherein one unit is performing the steps a) to e), and another unit is performing the steps f) to i).
  • Other units comprising other parts of the system are also contemplated, such as one unit performing the steps a) to f) or a) to g), and the other unit performing the rest of the steps.
  • Yet another unit may perform steps a) to c) and the remaining steps may be performed in another unit.
  • the system thus divided into two units, it is possible to obtain the spectroscopic information from a wide variety of decentralized locations and perform the process- ing centrally.
  • the data or the prediction and/or classification system may then be transmitted by any suitable means, such as conventional data transmission lines, telephone lines, or via internet or intranet connections.
  • This configuration facilitates the use of the prediction and/or classification system since any process-engineer or technician may provide the oil sample and have it subjected to spectroscopic analyses obtaining data variables without the need of being capable of conducting the processing and correlating procedures at the sampling site.
  • the engineer or technician may then obtain the prediction and classifica- tion results of the sample data from the central unit through a secured (internet) connection.
  • NIR near infrared
  • the 39 oil samples were analyzed in a 1 mm cuvette on a NIRSystems 6500 (Foss, Hiller ⁇ d, Denmark). NIR transmission spectra were recorded in the range from 1200 nm to 2500 nm. The same 39 samples were analyzed by an international approved laboratory for the following important oil quality parameters: Water concentration, Viscosity (at 40 and 100 degrees), Total Base number (TBN), Total Acid Number (TAN), Elemental analysis (e.g. metals) and particles. The NIR spectra were correlated to the laboratory values using chemometric modeling.
  • Figure 1 shows the measured NIR spectra. It is seen that there is a clear difference between the used oil samples (upper 17 curves) and fresh oil samples (lover curves).
  • Figures 2 to 6 display plots showing the laboratory value versus the value predicted by the chemometric model and NIR spectroscop for water (Fig 2), viscosity at 40 degrees (Fig 3), TAN (Fig 4), TBN (Fig 5) and Silicon (Fig 6). Full cross validation is used to validate the models. From the actual versus predicted plots it is clearly observed that it is possible to predict different oil quality parameters by the present invention.
  • Example 2 Classification of oil using fluorescence spectroscopy and chemometrics
  • FIG 7 shows emission spectra at 230 nm excitation for all samples. It is seen that there are three samples with a specific pattern having a strong signal around
  • Fig 8. shows the obtained classification of new and used samples where the new samples are marked with the dotted circle.
  • Fig 9 shows Extended Canonical Variates for the new samples (with negaive values) and old samples (with positive values)
  • NIR near inferred
  • the 149 samples were analyzed on a MB3600 NIR FTIR spectrometer (Q-lnterline). There were used 3 mm disposable cuvets and the samples were scanned from 1100 nm to 2500 nm measuring the transmission. The same 149 samples was send to an international approved laboratory for analysis for oil quality parameters like: Viscosity, Density, Total Base number (TBN), Total Acid Number (TAN), Elemental analysis (e.g. metals, Sulfur and Phosphor). The NIR spectra were correlated to the laboratory values using chemometric model- ing by PLS.
  • Figures 10 to 19 display plots showing the laboratory value versus the value predicted by the chemometric model and NIR spectroscop for viscosity at 100 degrees (Fig 10), density (Fig 1 1 ), TAN (Fig 12), TBN (Fig 13), sulfur (Fig 14), phosphor (Fig 15), vanadium (Fig 16), nickel (Fig 17), magnesium (Fig 18) and calcium (Fig 19).

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Abstract

La présente invention porte sur un procédé et sur un dispositif pour surveiller une condition et/ou qualité d'huile sur la base d'une fluorescence et/ou de spectres NIR, ainsi que sur la base de mesures de référence de laboratoire sur un ensemble d'échantillons d'huile. Par une analyse de données chimiométriques (à savoir, une analyse de données à plusieurs variables), les signaux et motifs spectroscopiques sont corrélés aux mesures de référence de laboratoire qui décrivent la condition et/ou la qualité de l'huile. Sur la base de cette relation, il est possible de prédire les mesures de référence et/ou les conditions d'un nouvel échantillon d'huile sur la base uniquement d'une fluorescence et/ou d'un spectre NIR de l'échantillon.
EP08864392.9A 2007-12-21 2008-12-19 Surveillance d'une condition et/ou d'une qualité d'huile lubrifiante, en ligne ou de ligne, sur la base d'une analyse de données chimiométriques de fluorescence et/ou de spectres proches infrarouges Active EP2232236B1 (fr)

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PCT/DK2008/050329 WO2009080049A1 (fr) 2007-12-21 2008-12-19 Surveillance d'une condition et/ou d'une qualité d'huile, en ligne ou de ligne, sur la base d'une analyse de données chimiométriques de fluorescence et/ou de spectres proches infrarouges

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